Sounds like the clutch is shot. See if it turns both ways, if so then you'll need a new clutch. Just make sure you are certain you are not in learning mode. It's easy to over look. Also, if your pump/ prop sucked up rocks then you would have some bad cavitation on take off.

1. A hose came off for the intake - Check all hoses, particularly the one from the supercharger to the intercooler.
2. The supercharger clutch failed - With the motor OFF take the intake hose off the front of the supercharger. If the SC wheel spins both ways the clutch is toast.